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Forum Index : Microcontroller and PC projects : Variable voltage and current power from phone chargers
| Author | Message | ||||
| damos Regular Member  Joined: 15/04/2016 Location: AustraliaPosts: 69 |
Power supplies just keep getting easier: Hackaday article One this becomes an ebay module, 5V from old phone chargers will be so passe. |
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| dddns Senior Member  Joined: 20/09/2024 Location: GermanyPosts: 259 |
Thanks for sharing :) |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 7499 |
PPS is clever, but as far as I know the output can't get below 3V3. Also, that litt;e module has to be powered from a PPS compatible charger or power bank, you can't just throw anything at it. Even compatible supplies are sometimes not compatible over the full range either, often only reaching 20V and that with reduced output current. Remember they are Watt rated, not Amps. PPS is pretty new. Don't throw out your trusty bench supply yet. :) Edited 2025-03-25 19:22 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10063 |
Don't understand  How does the MCU get its power in order to program the chip over I2C to tell it how to configure the supply? If by default the thing supplies 5V 1A I then need some complex circuitry supplying the MCU that then caters for the supply going up to say 20V from the original 5V. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7499 |
USB-C always outputs 5V by default so the PSP module will always have a supply. The external MCU won't be powered from the USB-C supply unless it incorporates its own switching reg to drop the voltage. That will need an input range up to 21V. You could, I suppose, simply run two switchers from the same battery, one is the USB-C output and the other a fixed voltage for the MCU. :) I don't particularly like switchers for bench supplies unless they are followed by a linear reg. They are too noisy. Edited 2025-03-25 19:40 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2394 |
I found this https://www.ebay.co.uk/itm/167237172295 |
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| damos Regular Member Joined: 15/04/2016 Location: AustraliaPosts: 69 |
That is a classic switching step up DC-DC converter running from 5V. It will give you the voltage but not a lot of current. The USB-C power delivery will give a wide range of voltages at 20mV increments with a lot of current. My phone has a 35W charger and many laptop chargers are 75W or 90W, so if you have one of those charges you can get a lot of power out of it. |
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